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This is a common problem with the V8 engines in the 540/740s. It is either the radiator neck or expansion tank which WILL fail in the range of 38 to 80k miles (sorry). The prices for DIY have come down quite a bit from before. There will eventually be a aluminum radiator but it is still being developed. At least it was covered.

a)you can't really do much unless you go with a diff unit (or one thing i have learned when sometimes they don't crack they POP out(the plastic end tanks is that 2 belt or 3 will keep them firmly intact

b)minimize the air in the system(never leave it up to dealer to check)
if you have only water no spaces it can evaporate...
if it does that air will increase the pressure tremendeously and POP you have one...

It will. FACT..
Betray, how many KMs do you have? It WILL happen anywhere from 45-120kKMs
Things to look for:
ANY white residue/spray.
That light which comes on is the possible death throes of the rad. The light may come on for who knows what (mine) and won't be the rad. but check really soon.
If you are looking for a aluminum rad for the car search BFC E38 they are still working on prototypes. They are available for "lesser;-)" BMWs but not for us yet. You will still need the expansion tank too. If you are nearing 100k KMs then buy a new rad and expansion tank. Better to shop around and have it on hand.

Radiators cost ~USD $160, expansion tanks ~35. Labor for DIY 1 12 pack of Labatts. Time= how long does it take to finish off a 12 pack, Eh?
Really, it isn't that bad. You should find a write up @ E38.org if you haven't looked there yet. But if you want to pay someone....I'm just guessing but I think I have heard ~4-500 USD at the high end.
When you reach 100+k if it isn't broken yet. FIX IT! The most mileage I have heard was 85k miles before it popped. Lowest 35k miles. Mine was done before I bought it at 40k miles. Avg. seems to be in the range of 55